Phonograph sound box



Nov. 23 1926. 1,608,423

R. E. POWER PHoNoGRAPH souND Box Filed June 2. 1925 me/nto@ Patented Nov. Z3, 1926.

PHONOGRAPI-I SOUND Application filed June 2, 1923. SerialxNo. 643,001.

' This invention relates to sound boxes for phonographs, and particularly'to means for mounting the needl-e of asound box `so as to permit free vibration thereof.

A further object is to provide a needle or stylus holder for sound boxes which is particularly adaptedl for t-he purpose of holding glass needles or needlesl of like frangible character.

A still further object is to provide a device of this character which does not use the or-dinary vset screw for the purpose of holding the stylus in place within its socket butwhich uses` a spring clamp for this purposey so that theneedle will not be subjected to Ysuch* strain as would be liable to break it, the device, however, being so arrangedv as to permit regular metal needles to be used.

Another object is to provide improved means for mounting the. support for the stylus bar and for the needle which will cause the proper transmission of vibration from the stylus to the stylus bar and thus to the diaphragm, and yet which is firmly heldin place within the sound box.

Other objects will appear in the course of the following description.

My invention is illustrated in the accompanying drawings, wherein Figure 1 is a'fragmentary front elevation ofa portion of a sound box with my improved stylus mounting thereon;

Figure 2 is a side elevation of the structure shown in Figure 1; Y

Figure 3 is a top plan View of the body 22;

Figure 4`is a section on the line 4-4 of Figure 1;

Figure 5 is a cross section online 5-5 of Figure 1;

Figure Gis a fragmentary section on the` line 6-6 of Figure 1.

Referring to these drawings, 1() designates a stylus'supporting member which is approximately rectangularin 'cross section and is formed upon' one face with a longitudinally extending recess constituting ya socket 11 for ther'eception of th-e needle 12, one face of the member 10 being provided with outstanding ears 13. Between these ears is pivot'ed the needle clamp 15, the lower end of which extends downward and is angularly bent and extended into the socket 11. This end 16 is recessed or slightly arcuate in form so as to embrace about one-third of the needle 12 and hold the needle firmly in position. The upper end of this clamp 15 is outwardly bent and formed with a head 17 which constitutes a finger piece'- whereby the clamp may be opened.

the other leg beingdlisposed within a notch y V-s'hapedy springlS ha'sone leg inserted in a notch 19,'

2O formed in the `face of the member/10,

this leg vof the spring being held. in'place bya screw 21;`

The member 10 has a base which is curved to approximate the curvature of the rim of .f

the sound 'box and embodies the two oppositely directe-d, slightly curvedv arms'. 22. The inner face of this base is longitudinally grooved, as at 23, and each arm'islformed with anr outwardly projecting ear 24, yone of these ears being on the'outer face of its arm r'and thev otherV ear being on the inner face lof its arm. These ears are perforated for the passage of attaching screws 25 having heads 26,' and ydisposed between the heads Vand the ears are thecoiledh springs 27.

YResting directly against the rim of the sound boxv is a plate v28 havingY apertures larger thanthe screws 25 and through whichthe screws pass. This plate bears 'directly against thev rim of the sound box and lhas on it two outwardly projecting posts or studs 29 which extend into the --groove 23 adj aoent the ends thereof and constitute fulcrums upon which the member 10 may rock. The screws 25v have screw-threaded engagement with the sound box, and anut 30 engages theyscrew and bears against the plate 28 to hold this plate in place;

Extending outward from the'upper end of the portion 10 midway between the extremities of the arms 22 is an outwardly extending lug 31 which is formed integral or castwith the body 10, this lug'having a tapering aperture 32 extending through it parallel to the face of the member 10'. The stylus arm 33 is angularly bent'at one end for vengagement with a diaphragm,-as at 34, the opposite end of thisarm being tapered and inserted in the tapered socket `32 and being drawn toward the lug 31 by means ofv an adj ustmentv 'screw ,35. Freferably lthe body 10 with the arms 22 are cast in one piece and preferably these partswill be made of blue vsteel'or like material.

lt will be seen that the springs 2'? pressing against the lugs 24 urge the body 1() with its arms 22 toward the sound box and that the nuts 30 force the plate 28 against the periphery of the sound box. It will further be seen that by adjusting the screws Q6 that the tension'ot the springs may be adjusted and that the body l0 is yieldingly t'o1ced toward the periphery ot the sound box and held in engagement with the lugs 29. The groove 23 and the lugs 29 are of such Ytorni as to permit the rocking ot the body lO upon these lugs 23 as upon a tulcruin. rlhe vibrations ot the diaphargm will vibrate one end ot' the stylus bar and this vibration will be communicated through the lug 8l to the body 10 which7 as before remarked, will roclr upon its tulcrum and this in turn will cause the vibration ot the stylus l2.

Preferably the needle l2 will be ot glass,

but l do not wish to be limited to this, as any type oit needle may be used in the socket ll, but the gripping means for the stylus or needle is particularly designed for gripping a glass stylus so as not to break it. lt the ordinary set screw is used such as is commonly round on phonographs, the pressing inward ot the set screw would tend to break the needle. Y rlhis cannot occur with my holder, while at the saine time the needle clamp holds the stylus `iirinly in place and prevents any play. By pressing upon the head ot the clamp l5, the needle will drop out and a new needle may be readily inerted.

It will be seen that this holder lits against the periphery'ot the sound box and not in front ot the sound box, thereby supporting the sound boX better and securing a better appearance.

l. i sound box having a diaphragm and a rim, means on the sound box :tor'supportin@` a stylus, said means comprising a radially extending member tormed at lits base with two integral laterally directed arms, and at its outer end with a stylus socket, the base being formed with a longitudinally` eze tending groove on its inside tace transversely curved and extending the full length ot the base, a plate disposed against the periphery of the sound bon, screws passing through the arms of said base and loosely through the plate and having screwethreaded ein.

gagenient with the sound box, nuts engaging said screws and bearing against the plate, tapering lugs projecting :trom the plate and having their apices bearing against the grooved inner face of the plate and torming ulcrums upon which the base may rock in a plane transverse to the plane ot the sound box, the groove acting to center the lugs, springs surrounding the screws and Lacasse bearing against the outer tac-es of said arms' and yieldingly resisting rocking movement of the member, a stylus bar operatively connected to the center ot the diaphragm, and a lug projecting from one tace ot the Amember with which said stylus bar engages, the op pcsito end ot' the member being provided with means tor supporting the stylus.

2. A sound box having a rim and a diaphragm, means for supporting. the stylus thereon comprising a radially extended member to med to provide a base `having a curvature corresponding to the curvature of the rim o'l" the soundvbox, this base projecting laterally, on each side beyond said member to provide oppositely disposed arms, one o'li said arms having a lug upon one edge tace and the other armfhaving a lug upon the opposite edge face,the inside i'ace of the base being longitudinally` grooved, the groove being transversely curved, a plate disposed against the periphery ot the diaphragm and having a plurality ci approximately triangular lugs eX- tending therefrom andinto said groove and `acting as rulcrums, the groove acting to center said lugs and the base having rocking engagement with said lugs, nuts engaging said screws n d bearing against the plates, springs surrounding the outer ends of the screws and bearing againstlthe Afirst named lugs on the arms whereby to yieldingly hold the base in engagement with the curved plate to permit the base to rock upon said triangular lugs, a stylus bar operatively connected to said member at one end and at itsr arin being tapered and disposed in vsaid tapered aperture and fitting the same, and a screw passing through said aperture and engaging thecnd of the stylus arm whereby the stylus `arm nay from time t-o time be adjusted in said taperednaperture.

ln testimony whereof Ihereunt-o atiix my signature. i

nnvn n. POWER.' i

3. The combination with a phonographic.

Soi 

